I shoot revolvers a lot, for a long time, but am not a revolver smith. So if I take the plate off, what exactly am I going to learn, compared to paying an experienced smith to take it apart and inspect each part??? Do you know what you are looking for if you take off the plate?
Therefore, if I buy a used revolver (as I did recently) that had been fired so little (probably less than one box) that it felt and shot like a new one, I cleaned and inspected as I do after shooting, and put it into storage.
On the other hand, I bought a well-used model 66 to set up for IDPA, found it had several wear or modification symptoms (push off, skipping, end shake) so it went to my gunsmith for "the works."
IMHO, taking a revolver apart is somewhat like taking your auto engine apart. Why, unless there is something wrong that whoever takes it apart is qualified to fix, and will recognize a problem part?